JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo">this is a new bar and bar</div>

CSS

.red {
    color:red
}

JavaScript

$(document).ready(function () {
		var search = "bar";
    $("div:contains('"+search+"')").each(function () {
        var regex = new RegExp(search,'gi');
        $(this).html($(this).text().replace(regex, "<span class='red'>"+search+"</span>"));
    });
    search = "new";
    $("div:contains('"+search+"')").each(function () {
        var regex = new RegExp(search,'gi');
        $(this).html($(this).text().replace(regex, "<span class='red'>"+search+"</span>"));
    });
});